Daylight hours in Hemel Hempstead
Hemel Hempstead gets 16h 39m of daylight on its longest day in June, and 7h 49m on its shortest in December — a difference of 8h 50m across the year.
How fast the days change
Around 17 March, Hemel Hempstead gains or loses about 4.0 minutes of daylight every day.
That is quick enough to notice week to week, which is why spring seems to arrive all at once this far from the equator.
Sunrise and sunset by month
On the 15th of each month, in Europe/London local time, daylight saving included.
| Month | Sunrise | Sunset | Daylight | Solar noon |
|---|---|---|---|---|
| January | 08:01 | 16:20 | 8h 19m | 12:11 |
| February | 07:15 | 17:15 | 10h 00m | 12:15 |
| March | 06:15 | 18:05 | 11h 50m | 12:10 |
| April | 06:05 | 19:58 | 13h 53m | 13:01 |
| May | 05:08 | 20:47 | 15h 39m | 12:58 |
| June | 04:42 | 21:22 | 16h 39m | 13:02 |
| July | 05:01 | 21:14 | 16h 13m | 13:07 |
| August | 05:46 | 20:25 | 14h 39m | 13:06 |
| September | 06:36 | 19:17 | 12h 41m | 12:57 |
| October | 07:26 | 18:08 | 10h 42m | 12:47 |
| November | 07:20 | 16:11 | 8h 51m | 11:46 |
| December | 08:02 | 15:51 | 7h 49m | 11:56 |
Solstices and equinoxes
| Date | Sunrise | Sunset | Daylight | |
|---|---|---|---|---|
| March equinox | 20 Mar | 06:04 | 18:14 | 12h 10m |
| June solstice | 21 Jun | 04:43 | 21:24 | 16h 41m |
| September equinox | 22 Sep | 06:48 | 19:01 | 12h 13m |
| December solstice | 21 Dec | 08:06 | 15:53 | 7h 47m |
The equinoxes give almost exactly twelve hours of daylight everywhere on earth — "almost" because sunrise is defined by the sun's upper edge rather than its centre, and the atmosphere bends its light over the horizon before it has really arrived. Both lengthen the day by a few minutes.
Other cities in United Kingdom
Assumptions
- Sea-level horizon. Hills, mountains and buildings all delay sunrise and bring sunset forward, sometimes by a lot in a valley.
- Standard refraction. Sunrise is taken at −0.833°, allowing for the sun's disc and average atmospheric bending. Unusual air conditions shift it by a minute or two.
- Local clock time, with daylight saving applied from the IANA timezone database.